MICROSYRINGE FOR PRE-PACKAGED DELIVERY OF PHARMACEUTICALS

• US 20080119787A1
• Filed: 11/21/2006
• Published: 05/22/2008
• Est. Priority Date: 11/21/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: KAEMMERER, WILLIAM F.
• Granted Patent: US 7,988,668 B2
• Time in Patent Office: Days
• US Class Current: 604/110
• CPC Class Codes: A61M 2210/0693 Brain, cerebrum
• CPC Class Codes: A61M 5/141 with capillaries for restricting fluid flow
• CPC Class Codes: A61M 5/14526 the piston being actuated by fluid pressure
• CPC Class Codes: A61M 5/16813 by controlling the degree of opening of the flow line

Abstract

A microsyringe includes a body, a barrier movable within the body, and a flow regulator. The body includes a pressurizable chamber, an inlet fluidly connected to the pressurizable chamber, an outlet fluidly connected to the pressurizable chamber, and a cannula fluidly connected to the outlet. The flow regulator is fluidly connected to the cannula to limit the flow of a pharmaceutical through the cannula to a maximum rate. The movable barrier fluidly separates the inlet from the outlet. A pharmaceutical is disposed in a space between the movable barrier and the outlet. The inlet is designed to mechanically and fluidly couple to a hydraulic fluid delivery system. Hydraulic fluid from the inlet pressurizes the chamber, causing the barrier to move and displace the pharmaceutical out of the chamber and into the cannula. The flow regulator ensures that the flow rate of the pharmaceutical through the cannula is not excessive. The movable barrier may be a piston or a collapsible membrane.

Claims

1. A microsyringe comprising:

a pharmaceutical reservoir chamber;

a pressurizable hydraulic fluid chamber;

a barrier moveably disposed between the pharmaceutical reservoir chamber and the pressurizable hydraulic fluid chamber, the barrier fluidly isolating the pharmaceutical reservoir chamber from the pressurizable hydraulic fluid chamber;

an inlet fluidly connected to the pressurizable hydraulic fluid chamber to provide hydraulic fluid to the pressurizable hydraulic fluid chamber;

a flow regulator fluidly connected to the pharmaceutical reservoir chamber and adapted to prevent a delivery rate of a pharmaceutical in the pharmaceutical reservoir chamber from exceeding a maximum rate; and

a cannula fluidly connected to the flow regulator.

2. The microsyringe of claim 1 wherein the pharmaceutical reservoir chamber is pre-filled with the pharmaceutical.

3. The microsyringe of claim 1 wherein the barrier is a plunger slidably disposed between the pharmaceutical reservoir chamber and the pressurizable hydraulic fluid chamber.

4. The microsyringe of claim 1 wherein the barrier is a collapsible membrane.

5. The microsyringe of claim 1 wherein the inlet is adapted to fluidly connect to a hydraulic fluid delivery system.

12. The microsyringe of claim 1 or 6, wherein the pharmaceutical comprises a gene therapy system.

13. A method of delivering a pharmaceutical to a desired target location within a patient comprising:

locating the desired target location;

placing a distal tip of the microsyringe of either claim 1 or claim 6 into a position allowing a direct access to the desired target location, wherein the microsyringe contains the pharmaceutical; and

releasing the pharmaceutical.

14. The method of claim 13, wherein the desired target location is within a brain of the patient.

6. A microsyringe comprising:

a body comprising;

a pressurizable chamber;

an inlet fluidly connected to the pressurizable chamber and adapted to connect to a hydraulic fluid delivery system;

an outlet fluidly connected to the pressurizable chamber; and

a cannula fluidly connected to the outlet;

a barrier movably disposed within the pressurizable chamber and fluidly separating the inlet from the outlet; and

a flow regulator fluidly connected to the cannula and adapted to prevent a delivery rate of a pharmaceutical flowing through the cannula from exceeding a maximum rate.

7. The microsyringe of claim 6 wherein a pharmaceutical reservoir chamber extending between the barrier and the outlet is pre-filled with the pharmaceutical.

8. The microsyringe of claim 6 wherein the barrier is a plunger slidably disposed in the pressurizable chamber.

9. The microsyringe of claim 6 wherein the barrier is a collapsible membrane.

10. The microsyringe of claim 6 wherein the body is made of a material capable of withstanding temperatures of at least −

80°

C.

11. The microsyringe of claim 6 wherein the cannula is a catheter.